GMS:MODFLOW DRT Package Workflow

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To use the drain return (DRT) package in an existing MODFLOW project, use the following processes:

1. Begin with an existing MODFLOW project.
The existing model can be created using the conceptual model or grid based approach.
2. Activate the drain return package.
  1. Select MODFLOW | Global Options.
  2. In the MODFLOW Global/Basic Package dialog, select the Packages button.
  3. In the MODFLOW Packages/Processes dialog, select the DRT1 – Drain Return option.
3. Create DRT boundary conditions.
  1. Using the Select Cells Select 3D Cell Tool.svg tool, select cells in the drain boundary condition area.
  2. Select the MODFLOW | Advanced | Sources/Sinks... menu command.
  3. Enter drain return values in the MODFLOW Sources/Sinks dialog.
4. Modify DRT inputs.
  1. Select the MODFLOW | Optional Packages | DRT – Drain Return… menu command.
  2. Modify inputs in the MODFLOW Drain Return Package dialog.
5. Run MODFLOW.
  1. Save Save Macro.svg the project.
  2. Run MODFLOW Run MODFLOW Macro.svg.


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